Year	Percent
1979	11.80886
1980	19.90683
1981	27.26048
1982	57.203
1983	16.39746
1984	20.99634
1985	27.75192
1986	29.00016
1987	29.57452
1988	10.82331
1989	16.49658
1990	14.0267
1991	21.1683
1992	39.29573
1993	66.93562
1994	37.92558
1995	36.38384
1996	32.53106
1997	40.38191
1998	35.25061
1999	55.6883
2000	50.43318
2001	44.11112
2002	34.79944
2003	55.31004
2004	67.8181
2005	86.04199
2006	105.04318
2007	131.53192
2008	49.90097
2009	90.99145
2010	97.43353
2011	59.98529
2012	62.90619
2013	69.5073
2014	65.01749
2015	81.54754
2016	67.34391
2017	65.8539